A 12-year-old neutered male Yorkshire Terrier presents because of a recent onset of oral bleeding and a foul odor from the mouth. The patient is otherwise healthy, but has stopped eating and playing with his toys. On physical examination, a large, ulcerated, infected flesh colored mass is present. The peripheral lymph nodes are normal and there are no other significant findings on physical examination. Under anesthesia, the mass is seen to extend from in front of the right canine tooth, crosses the midline past the second incisor tooth on the left, and measures 2.5 × 3 × 2 cm. This radiograph was taken while the patient was under anesthesia (1). https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315381855/ed5d8ab2-a809-41b0-8b0f-afbaed10c06f/content/1.jpg"/>

What are the radiographic findings?

What diagnostic tests should be performed prior to a treatment decision?

The biopsy revealed an undifferentiated sarcoma. What further information should be gained from the tissue sample?

What further staging tests are recommended in light of the histopathology results?

What type of surgery and postoperative therapy are indicated for this patient?